How to check if Two Lists have Same Elements (Regardless of Order) in C# - Step by Step Examples

How to check if Two Lists have Same Elements (Regardless of Order) in C# ?

Answer

In C#, you can convert both lists to sets and compare them to check if they have the same elements regardless of order.


✐ Examples

1 Check Equality of Unordered Lists - Same Elements

In this example,

  1. We create two lists: list1 and list2 with the same set of elements.
  2. We convert both lists to sets using the HashSet class.
  3. We compare the sets using the SetEquals method.
  4. Finally, we print the result to standard output.

C# Program

using System;
using System.Collections.Generic;

class Program
{
    static void Main()
    {
        List<int> list1 = new List<int> { 1, 2, 3 };
        List<int> list2 = new List<int> { 3, 2, 1 };
        HashSet<int> set1 = new HashSet<int>(list1);
        HashSet<int> set2 = new HashSet<int>(list2);
        bool result = set1.SetEquals(set2);
        Console.WriteLine("Do the lists have the same elements? " + result);
    }
}

Output

Do the lists have the same elements? True

2 Check Equality of Unordered Lists - Different Elements

In this example,

  1. We create two lists: list1 and list2 with different sets of elements.
  2. We convert both lists to sets using the HashSet class.
  3. We compare the sets using the SetEquals method.
  4. Finally, we print the result to standard output.

C# Program

using System;
using System.Collections.Generic;

class Program
{
    static void Main()
    {
        List<int> list1 = new List<int> { 1, 2, 3 };
        List<int> list2 = new List<int> { 4, 5, 6 };
        HashSet<int> set1 = new HashSet<int>(list1);
        HashSet<int> set2 = new HashSet<int>(list2);
        bool result = set1.SetEquals(set2);
        Console.WriteLine("Do the lists have the same elements? " + result);
    }
}

Output

Do the lists have the same elements? False

Summary

In this tutorial, we learned How to check if Two Lists have Same Elements (Regardless of Order) in C# language with well detailed examples.


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